BIOL 1201 : Biology Notes5 For Exam 5
Document Summary
Types of plant hormones: strigolactones, apical dominance, germination, attract mycorrhizal fungi to the root. Auxin and cytokinin in apical dominance: auxins inhibit lateral shoot development, cytokinins stimulate lateral shoot development. One way to regulate the process is to have two controllers that do opposite things. Whether or not we get lateral branches is dependent on the ratio of one to the other. Key features: broad effects controlling major physiological processes, most occur in antagonistic pairs, stimulator and inhibitor, such a major way to regulate everything in biology! How does this control flowering: short day plant (long night, at night, pfr is slowly naturally converted to pr. If light is shined on it, the night length is reset by destruction of pr, back to pfr: high concentration of pr prevents flowering. Chemical signaling in animals: two major systems, endocrine, hormones secreted into blood stream, nervous, neurotransmitters secreted into the synapse (junction) between neurons.
